CFD Study About Low Reynolds Number Turbulence Model Of Shear Flow Near The Wall

Low Reynolds number turbulence can be seen everywhere in the engineering practice,especially in pipe flow or slot flow near the wall.With the development of industry,more and more concentrated on the study of low Reynolds number turbulence,such as flow control,the aerodynamic performance of prediction and the improvement of lift,the elimination of drag,etc.Therefore,the low Reynolds number turbulence numerical studies for these devices and engineering applications become important.This paper is about wall shear flow numerical example,and the purpose of this paper is to study the flow characteristics of low Reynolds number interval and the characteristics of turbulence model.First of alL in this paper,the calculation model under the condition of the steady state,we applicate FLUENT 14.0 software of low Reynolds number turbulence model for numerical calculation,and get the corresponding steady state flow field of the model,through the analysis of the fluid performance of different parameters,it is concluded that iin low Reynolds number k-?model,LB,AKN model is the most advantage of the speed calculation value and experimental value is most consistent with;The standai'd k-s model and LS model calculation value of speed obviously on the low side;AB,YS5 CHC model is too large and LS,SKE model is small.Secondly,under transient conditions,we use large eddy simulation model for simulation calculation,aimed at analysis of structure and characteristics of turbulence vortex near the wall.Finally,we can summarize the research results of wall shear flow and put forward the prospects for the future by the results of the analysis.